Views default argument handler to show content that references the same noderef nids that this content references

views_arg_related_refs.php

<?php

// Show content that references the same noderef nids that this content references

// The referencing field name.
$field_name = 'field_blog_ref_page'; // <--- Change this to your field name.
$node_type = 'blog'; // <--- Change this to your node type.

if (arg(0) == 'node' && is_numeric(arg(1)) && !arg(2) ) {
  
  $related_ids = array();
  $node = node_load(arg(1));
  
  if ($node->type == $node_type) {
    $related = field_get_items('node',$node,$field_name);
    if ($related && is_array($related) && sizeof($related) > 0) {
      for ($i=0; $i<count($related); $i++ ) {
        $related_ids[] = $related[$i]['target_id'];
      }
    }
  }
   
}
return !empty($related_ids) ? $related_ids[0] : FALSE;

// return syntax for multivalue fields
// TODO: check sizeof($$related_ids) > 0
// return !empty($related_ids) ? implode("+", $related_ids) : FALSE;